Fault Consideration & Fault Exclusion ISO 13849 – 1, Chapter 7 [1, 7] discusses the need for fault consideration and fault exclusion. Fault consideration is the process of examining the components and sub-systems used in the safety-related part of the control system (SRP/CS) and making a list of all the faults that could occur in each one. This a definitely non-trivial […]
Note: A shorter version of this article was published in the May-2012 edition of Manufacturing Automation Magazine. When designing safeguarding systems for machines, one of the basic building blocks is the movable guard. Movable guards can be doors, panels, gates or other physical barriers that can be opened without using tools. Every one of these guards […]
I’ve now written six posts, including this one, on the topic of circuit architectures for the safety-related parts of control systems. In this post, we’ll compare the International and North American systems. This comparison is not intended to draw conclusions about which is “better”, but rather to compare and contrast the two systems so that […]
Get more information on CSA Z1002. The draft of this document is now available for public review through CSA.
Five things that most machine builders fail to do. With a Sixth Bonus failure!
If you are an industrial robot user in North America (Canada and the USA primarily), you know ANSI/RIA R15.06 and CSA Z434. Did you know that ANSI has adopted the ISO robot safety standard? Learn more here…
I get a lot of calls and emails asking about emergency stops. This is one of those deceptively simple concepts that has managed to get very complicated over time. Not every machine needs or can benefit from an emergency stop. In some cases, it may lead to an unreasonable expectation of safety from the user, which can lead to injury if they don’t understand the hazards involved. Some product-specific standards